Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-11-23T10:39:32.323Z Has data issue: false hasContentIssue false
  • English
  • Français

Turbulent diffusion and galactic magnetism

Published online by Cambridge University Press:  21 October 2010

Axel Brandenburg  and
Fabio Del Sordo
Axel Brandenburg
Affiliation:
NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden; and Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden
Fabio Del Sordo
Affiliation:
NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden; and Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Using the test-field method for nearly irrotational turbulence driven by spherical expansion waves it is shown that the turbulent magnetic diffusivity increases with magnetic Reynolds numbers. Its value levels off at several times the rms velocity of the turbulence multiplied by the typical radius of the expansion waves. This result is discussed in the context of the galactic mean-field dynamo.

Keywords

turbulence(magnetohydrodynamics:) MHDgalaxies: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 432 - 433
Copyright
Copyright © International Astronomical Union 2010

References

Brandenburg, A. 2005 Astron. Nachr., 326, 787CrossRefGoogle Scholar
Ferrière, K. 1992, ApJ, 389, 286CrossRefGoogle Scholar
Krause, F. & Rädler, K.-H. 1980, Mean-field magnetohydrodynamics and dynamo theory (Pergamon Press, Oxford)Google Scholar
Mee, A. J. & Brandenburg, A. 2006, MNRAS, 370, 415CrossRefGoogle Scholar
Schrinner, M., Rädler, K.-H., Schmitt, D., et al. 2005, Astron. Nachr., 326, 245CrossRefGoogle Scholar
Sur, S., Brandenburg, A., & Subramanian, K. 2008 MNRAS, 385, L15CrossRefGoogle Scholar